Fuel Feed Pump - Fits Mercury, Mariner, Tohatsu 9.9HP-20HP EFI (Replaces 8M0134464, 3RS-04302-0)
Fuel Feed Pump - Fits Mercury, Mariner, Tohatsu 9.9HP-20HP EFI (Replaces 8M0134464, 3RS-04302-0) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This replacement Fuel Feed Pump – Fits Mercury, Mariner, Tohatsu 9.9HP-20HP EFI is engineered for 4-Stroke EFI outboard engines from 2017 to the present. It ensures reliable fuel delivery, restoring performance and efficiency to your motor.
This part is a direct interchange for Mercury part number 8M0134464 and Tohatsu part numbers 3RS-04302-0 and 3RS043020.
- Engineered for direct OEM replacement fit and function.
- Constructed from durable, corrosion-resistant plastic housing.
- Designed for use with standard marine gasoline.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 8M0134464 |
| Tohatsu | 3RS-04302-0 |
| Tohatsu | 3RS043020 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury & Mariner Owners: This pump fits 9.9HP, 15HP, and 20HP 4-Stroke EFI models manufactured from 2017 onwards.
For Tohatsu Owners: This pump is compatible with MFS9.9E, MFS15E, and MFS20E EFI models from 2017–2018.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4-Stroke EFI | 9.9 | 4-Stroke | 2017–Present | 8M0134464 | 2-Cylinder |
| Mercury | 4-Stroke EFI | 15 | 4-Stroke | 2017–Present | 8M0134464 | 2-Cylinder |
| Mercury | 4-Stroke EFI SEAPRO | 15 | 4-Stroke | 2017–Present | 8M0134464 | 2-Cylinder |
| Mercury | 4-Stroke EFI | 20 | 4-Stroke | 2017–Present | 8M0134464 | 2-Cylinder |
| Tohatsu | MFS9.9E EFI | 9.9 | 4-Stroke | 2017–2018 | 3RS-04302-0 | |
| Tohatsu | MFS15E EFI | 15 | 4-Stroke | 2017–2018 | 3RS-04302-0 | |
| Tohatsu | MFS20E EFI | 20 | 4-Stroke | 2017–2018 | 3RS-04302-0 |
Technical Specs
- Product Type
- Fuel Feed Pump
- Installation
- Direct OEM Replacement
- Fuel Type
- Gasoline
- Connection
- Hose Barb
- Housing Material
- Plastic
- Housing Color
- Black
- Dimensions
- Length: 8.0in; Width: 3.5in; Height: 5.5in
- Weight
- 80g (0.18lb)
- Other Technical Attributes
- Shaft to Plastic Base: 33.3mm (13.1in)
What’s in the Box
- 1 x Fuel Pump (Replaces 8M0134464/3RS-04302-0)
Installation Notes
- Disconnect the negative battery terminal to prevent electrical hazards.
- Relieve fuel system pressure by following the engine manufacturer's procedure. Use caution and wear safety glasses.
- Place an absorbent shop towel under the fuel pump to catch any spilled fuel.
- Carefully disconnect the fuel lines and electrical connector from the old pump.
- Remove the mounting bolts or hardware securing the old fuel pump and remove it from the engine.
- Compare the new pump to the old one to ensure an exact match.
- Install the new fuel pump using the original mounting hardware, ensuring a secure fit.
- Reconnect the fuel lines and electrical connector.
- Reconnect the battery terminal.
- Prime the fuel system according to your engine's service manual.
- Start the engine and carefully inspect for any fuel leaks at the connections. Do not operate if leaks are present.
Troubleshooting & FAQ
How do I know if my fuel pump is failing?
Common signs of a failing fuel pump include difficulty starting, engine sputtering at high speeds, stalling, loss of power, and unusual whining noises from the fuel tank area. A diagnostic pressure test can confirm if the pump is providing adequate pressure.
Is this pump compatible with ethanol-blended fuels?
Yes, this fuel pump is designed to be compatible with modern gasoline, including fuels containing up to 10% ethanol (E10). However, sustained use of higher ethanol blends is not recommended unless specified by your engine manufacturer.
What is the recommended replacement interval?
There is no fixed replacement interval for this fuel pump. It should be replaced when it shows signs of failure or during a major engine overhaul. Regular fuel filter changes can help extend the life of the pump.
My engine isn't listed, but the part number matches. Will it fit?
If your original part has the number 8M0134464 or 3RS-04302-0, this pump should be a direct replacement. However, always verify by comparing the photos and specifications to your existing part to ensure a perfect match, as subtle variations can exist.
Do I need to replace any other parts with the fuel pump?
It is highly recommended to replace the fuel filter when installing a new fuel pump. Debris from an old filter can damage the new pump. Also, inspect fuel lines and clamps for wear or damage and replace them if necessary.
What is the difference between this and an OEM part?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
How fast is shipping?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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